Pinpoint Test BW: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) U0423:00 Invalid Data Received From Instrument Panel Cluster Control Module

Refer to POWER STEERING CONTROLS for schematic and connector information.

Normal Operation and Fault Conditions

Description

Description
The PSCM monitors the HS-CAN messages when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.

Pinpoint Test Applicability

Pinpoint Test Applicability
This test applies to PSCMDTC U0423 Invalid Data Received from the IPC only. It does not apply to any other module except the PSCM.

DTC Diagnostic Strategy

DTC Diagnostic Strategy
If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose
To direct the diagnosis to the module and associated circuit sending the faulty or unknown information in the messages.

Diagnostic Aids

Diagnostic Aids
For additional information on the messages sent to the PSCM from the IPC module, refer to the Network Message List in the Power Steering article.
DTC U0423:00 indicates a concern with the IPC. The module reporting this DTC is not the problem module. Do not install a new PSCM as part of the repair for PSCMDTC U0423:00.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PSCM U0423:00	Invalid Data Received from Instrument Panel Cluster Control Module: No Sub Type Information	This DTC is set if the PSCM receives an "fault" or "unknown" message from the IPC instead of valid sensor information.

Possible Sources

Visual Inspection and Pre-checks

This DTC sets when the PSCM does not receive the IPC messages within a certain time frame. This can occur if the IPC wiring harness or electrical connectors are loose or damaged, or if the vehicle battery state of charge levels are low. Consult the DTC Index for additional information if needed.
Refer to Steering GSB for additional connector and wiring inspection tips.